A/R Payments

Hi Folks,

I am trying to add payment information to my A/R invoices. My test company has a formula field called "Payment" with the following formula "formula = {@NetInvoice} + {AR_InvoiceWrk.FreightAmt} + {AR_InvoiceWrk.SalesTaxAmt}" that does not seem to work in my real company.

Are payment stored in a different object?

Thanks,